Relay system.



E. W. PRESTON L G. L. NERSGE,

RELAY SYSTEMI APPLICATION FILED JAN.25,1912.

LII $5 nl vom w.

Wi T/VESSES:

@mirror @LA EDNN YV. PRESTON AND GEORGE L;

RELY SYSTEM.

nefs,

Application filed January 25 To all 'whom if may concern.'

Be it known that We, EDWIN TV. PRESTON :incl Grenen L. Nicnnnson, liotli citizens of the United States, residing :it Sioux City, in the count;Y of lllootlbury arnl State of lou'n, lliure invented new and useful linproreinents in Relay Systems, of which tnc tlilloning;` is n specification.

Our inrention relatos to a. system of relays, tllc operation ci wliicl'is automatically controlled by speech-currents from a telephone transmitter, or siinilnr u'cal; currents.

l't especially serviceable in loiig-distunce telephony as commercially practised, for the. purpose ot e uinectinf; repeaters; yet is susceptible et' use in wireless telcg'rnpliy for operatingl local souinlcrs or it may oe used in connection with telephone service ineters.

yWe lierein describe and illustrate our sysL tern in ,a duplicate symmetrical Vtorni for re- Yersiloly clircetinfr a repeatinj device; but, we Ywould not be understood` as. or liinitecl toprnctising our invention solely for tlns purpose.

The installation for the purpose above mentioned is preferably inutle n portion of a cord-circuit ot an exeliange VYltclrlmanl, yet it may be located 4any poi intermediate between telephones which it is desirous to connectn Y The repeater which We prefer to employ consuls. on its receiving side, of a permanent i. tenet, Wound "*itli helices of Wire;

antl on its transmitting side, of o transmitter, controlled 'oy tlie magnet. oncl in circuit u'it'i a battery nml the primary ol un induction coil haring two windings., This type ol repeater is t'ainiliar `tonll versed in tlic nrt, and tllal its use ainplitilos transmis sien is conceded; but,l heretofore-it has been commercially iinpructicnble, chiefly because et its adaptability tor 'one-Way transmission only. This tlit'iicnlty we here orercorne.`

ln tlie installations presented by Randall in llnilctl States Patents 1,008,800, 1,008,501 und 1,008,802, apparatus are disclosed Jfor reversing` repeaters, but they seern impractical in-zis-iniufh as they are manually conlrolletl.

This defect We have eliminatccl. ll've llave perfected u system which automoticnlly directev a repeater with respect to two sulistetions, according. es the direction of transmission.

urnlity of t-lie cr reproclucers i rniingtl e,

Speccaton of Letters Patent.

one for the usual purpose ot rcp vone sitle currents 'generated in am induction coil poteiitial suinciently Moz, .i

. .mi l as will be presently inacle ino e ele speech from one telephone to one simplify our tlescription hereinafter be culled tronstor other mechanical 'devices requette installation are relays, batteries, oo-oe and inipeflance coils, all of Well linoiflfn t or of suoli si ccializerl forro will be rcnoi 1 appreciutee 'nn l le following; clcsci. reference being; lll-c to the eccorn4 tirer-,ing which is a (li our inve; tion, n substL on being et. nt each siclcjtlicreof.

ln tine. illustration tire sulmsto.tionsl :irc equipped ns usual, eacli timing niii'ter in local circuit with battery 'die Z5 primary of an inducir '1- coil; their seco aries beings; associated, respectiveljjf, with nietnllie circuits cA :mtl custi'nnarya circuit is ,.liown ry col..

repeater circuit li so a loopt enel noi'Y i,

site end. The loop mally-eiose-:l contact-spring S" Winn is coinvino-nly l-:nown vns slow-oc* r lay. Associated in series with sait 85 the receiving side oi a 'transfo-inner prisecl of helices of 19; upon .a nent magnet 12' The tl bon-cell transinn net, und snicl transl itt/er is in lo with Tcattery 19@ enel un inductioinary 129; a secondary winding' is directly Connected to a siniilnr tra kenner i3. cons sting of pcrn'ianent inw net lh, Se with helices or Wire Wound thereon l, :i transmitter lf3, similarly nssccintel with seid magnet :incl in series W tli battery ancl primary of an induction coil 13e., f tern'iinal of 'lille secondary winding iff or lo@ said induction coil is conncctetl, tlirongolnn tery 1G, with one side ot a relay l; enel tire opposite terminal of sffifl secondary is connccteil, through n conf tactfspl-inp 2" et n relay i2, LCLA wally-clonal circuit 'for .tlow oit turrent from batteri.' .lt through the relay l.. @This current in be ot only sutiicient potential to illy partially energize the relay l, as it is not desired to attract the arun'iture thereof only as current tlows 'trein the secondary liti. connected across the .li condenser .tl contact-springs and 2b, designed to absorb the oscillations incident to the opening of said snrinws. The condenser ll prevents tbe flow olY current trom battery t6 hack through the secondary l-5". The in'esence of the impedance coil t5 and the condenser tt is, however, arliitt'ary; but their use seems more economical iti-asiuiuch as the resistance et the inmedance coil is much greater than that of the induction coil secondary, and, therefore, draws less current. llfhen associated with lines otl comparatively low resistance, one or both ot the transformers 12 and L3 niay be omitted.

The relay l controls the normally-open contact, o springs l and lb, the toi-nier beingv connected to one terminal ot a slowacting relay 3 and the latter connected to one side of the relayr the opposite sides oit said rel: Jeing interconiiected through batteryy shown at 1S.

The slow-acting ie lay 3 controls the contacts 'of three springs, 3, JD and 3C, the latter two being normallyclosed and so adjusted as to open the loop B, connected therewith, when said relay is actuated. Relays fland 5 and battery 19 are connected in a series circuit terminating on the iiorinaily-open contact-springs 3 and Bb. `lmgh of said relays has four springs, respectively, l, 4h, land eidg and 5, 1j", 5C, and 5d, all the contacts ot which are norn'ially-open. 'lhe colitact-sj'uings ft" and 4; are directly connected with the receiving helices 28 ot a repeater and in multiple with similar coi'itact-sln'ings 9 and D ot' a relay t) in the companion circuit. The contact-springs Ale and ftd are movable and are 'the terminals el. the repeater link A, and multiple with contact-springs l and l0 of i. relay 1.0 in the corresponding circuit.

'lio the contact-springs 5 and 5 are connected the lines of the opposite repeater link B and 'the contact-sprii'igs 9b and 0 ot a relay l in the opposite circuit. rlhe movable eontactss'nings 5') and fidare connected with cfirituctsprings b and iOl ot the relay l0. a d in multiple with a eircuit leading to the s -ci'nularyi or transmitting' side, QS of the repeater rl'he rept-iter represented at Q8 is constructed suhftantially the saine as the transtorzuei hereinhetore mentioned, havingr a perinai'ient magnety 2W, helices ot wire thereon, controlling; a variable resistance .280 in local circuit with battery 28d and an induction primary 28p', a second Vwi'nclingv being shown 253i.

Ttit/'e have described the constructifni ot Loo/eene one halt the system shown and the compani'on circuit is a replica thereof, the opl eration of' which is as follows: The risinfal and falling` speech currents tlowing from substation B over loop l, (normally-closed at relay 3), and through the windings 20 or' the transformer.' Q0, will vary the attraction of the permanent magnet 201 and ao (.:ordingly cause vibration of the diaphragm of the transmitter Qtr; thus causing a variation of the resistance ot :said transmitter, and a corresponding variation in the current flow from battery d through the induction priinaryQ()e associated therewith. This disintensitied alterruiting,r current: to flow from the secondary QOf through the helices Q1 of the second t'anst'oriner 2l; and in Similar fashion the magnet 2lb acts upon the transmitter 21C, causing undulating' currents g to flow in the primary 2le from battery 21d; the current generated thereby in the scoefndary 2t" passes through the condenser 22, the contact-springs la and 7b, and, augmented by the battery 24, (shown in circuit with the impedance coil 23), actuates the relay G, closes the Acontact-springs G and Gb, thus energizing simultaneouslyrelays 7 and S, in local circuit with battery 26, the toi-nier relay opening the contact-springs u and 7l', thereby denergizing the relay 6. t is now clearI that the relays 6 and 7 alternately interrupt one ,another continuously as current flows from the Secondary 21.1. The relay 8, being slow-acting, cannot follow the rapid interruptions of relays' t5 and 7, and, therefore, its armature remains att acted during such interruptions and holds onen the loop .ft, leading"froin the coinpanion circuit and 'terminating on contactsprings 8b and 8; and holds closed the con- ,tact-springs8a and 8l and the circuit'associatied therewith, (thereby actuating' the relays 9 and 10, shown in series with at It). rlthe relay 9, by 'closing the contact-- springs and 9b, and 9c, and 9, directly connects the link l. with the receiving,r side, or windings 28a, of the repeater 28. lhe relay 10, by closing the contact-springs 10l and 10i", and. '10C and itOd, directly connects the transmitting side, or secondary Qtf oft said repeater with the link llt ot the cornpanion circuit. in a similar manner-the speech waves emanating' from the substation A direct the repeater 28 in the opposite direction, imluetively linking together the two /suhstationsr` and rendering' inoperative the corresponding apparatus by'holding open the loop l.

tl'a'viuy,` thus described our inyention, what we claim as new and ldesire to secure by lluited States Letters Patent, is:

'1. lle combination with two telephone lieolated each from the other of a sim turhancein the primary circuit causes anba'ttery lines, normally inductively and conductively metrical relay system, each half comprised of the following elements z-ea circuit, closed when the other half is inactive; receiving helices; connected to one of said lines; by said circuit; a variable resistance, controlled by said helices; a circuit. for said variable resistance; a source of electrical energy and an inductive primary contained in said circuit; an inductive secondary, related to said primary; receiving helices, connected with said secondary; a variable resistance, controlled by said helices; a source of electrical energy and an inductive primary, both connected with said variable resistance; an inductive secondary; related to said primary; a sensitive relay; a circuit connecting said relay and secondary; an impedance coil across said circuit.; a .condensing means in series therewith; a source of direct current in series with the impedance coil and sensitive relay; a circuit controlled by the sensitive rela 7; an interrupting relay, a slow-acting relay and a source ot' direct current in said circuit; the interrupting relay adapted to alternately open and close the circuit containing the sensitive relay; a condenser as a shunt across the circuit portion opened; means for preventing the operation of the other halt ot' the system, controlled by the slo "-acting relay; means governed by the slow acting relay for connecting a repeating device with and between the said two telephone lines, said repeating device being oppositely directed, with respect to the halt of the system operating.

2. The combination with two telephone lines7 normally conductively and inductively isolated each from the other; of a relay stem of two halves, each half comprisingz-a sensitive relay; an inductive link associating said relay with one of said lines; an auxiliary circuit for said relay; a source of direct current in said auxiliary circuit; a local circuit controlled by the sensitive relay; two relays and a source ot direct eurrent in the latter circuit; one ot said relays adapted to interrupt the circuit containing the sensitive relay v; a condensing means across the point ot' interruption; the other ot said two relays adapted to render inoperative the other halt of the system; a local circuit goierned by the last named relay and contnolling means for inductively linking together the two telephone lines.

rllhe combination with two portions ot a telephone line; said portions beingnormally directly out ot conductive or inductive relation each to the other, ot a symmetrical relay system, either halt inoperative while the other is activefand each half associated with a different one of said line portions and comprising1-an inductive link; an electromagnet identified with one of said line portions by means of said link; an auxiliary circuit for the electro-magnet; a source of energy and impedance means in said circuit; means controlled by the electro-magnet adapted to intermittently open the circuit in which the said magnet is connected; condensing means as a shunt across the circuit portion opened; and switching means controlled by sai-d eleetro--magnet for governing another circuit.

-l. The combination with two telephone circuits and a repeater` said circuits being normally conductively and inductively isolated each trom the other` ot a switching system ot'two halves, each half comprising ap'paratus adapted to connect the receiving circuit of the repeating telephone with one of the telephone lilies and the transmitting circuit of the repeating telephone with the other telephone line; a relay adapted to control said apparatus and to prevent fthe reversal of the repeating telephone; an electro-magnet adapted to govern Said relay`;"`tan inductive link joining the electro-magnet and the telephone circuit with which it is identified; an auxiliary circuit for the electro-magnet; a source of cur` rent and an impedance therein; a relay governed by said electro-magnet and adapted to intermittently break said circuit.

rlhe combination with a source ot itiduced currentf of a sensitive relay; a source of direct currentas an auviliary to the induced VVcurrent for energizing said relay: means for intermittently deiinergzing said relay; and local clectromagncts controlled by said relay.

tl. The comhiimtion with local electrdmagm ot a sensitive relay adapted to govern said electron'iagncts; a source ot induced current for the control thereof; a source ot direct current as an auxiliary to the induced current| 'tor energizing said relay; and means Vlor intermittently dctncrgizing the relay.

Signed at Sioux (lity, county ot loodbury, and State ot' lova, this Hltccnth day ot January. i012, in the presence ot tas-o witnesses.

llDlVlN lV. PR'IGS'N. (llUltGlG L. NICKERSON. lliitnesses:

il". li. Sianowiou; (l. Snnowioit. 

